Illumination unit for an instrument



FIG. 1 is a perspective view of an illumination unit for an instrument showing my new design, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a left side elevational view thereof, with theopposite side being a mirror image;

FIG. 3 is a front elevational view thereof;

FIG. 4 is an enlarged perspective view thereof;

FIG. 5 is a perspective view of a second embodiment thereof;

FIG. 6 is a front elevational view of a third embodiment thereof;

FIG. 7 is a front elevational view of a fourth embodiment thereof;

FIG. 8 is a front elevational view of a fifth embodiment thereof;

FIG. 9 is a front elevational view of a sixthe embodiment thereof;

FIG. 10 is a front elevational view of a seventh embodiment thereof; and,

FIG. 11 is a front elevational view of a eighth embodiment thereof. 

The ornamental design for an illumination unit for an instrument, as shown and described. 